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Simple Machines. SOL 3.2. Machine – a tool that helps us do work. Machines help us by: Changing the amount of force on an object. Changing the direction of the force. Force is a push or pull that changes the motion or shape of an object. Example: I push a bookshelf to move it.

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machine a tool that helps us do work
Machine – a tool that helps us do work

Machines help us by:

  • Changing the amount of force on an object.
  • Changing the direction of the force.
force is a push or pull that changes the motion or shape of an object

Force is a push or pull that changes the motion or shape of an object.

Example: I push a bookshelf to move it.

energy is the ability to do work

Energy is the ability to do work.

Example: I must have energy to run the mile.

work is the result of force moving an object

Work is the result of force moving an object.

Example – Picking up something heavy is hard work!

gravity

Gravity

Gravity is the force that constantly pulls objects toward Earth.

simple machines have few or no moving parts
Lever

Inclined Plane

Wedge

Screw

Wheel and Axel

Pulley

Simple machines – have few or no moving parts
lever made of a board or bar set on top of a fulcrum it is used to lift weight

Lever –made of a board or bar set on top of a fulcrum. It is used to lift weight

Example: seesaw, crowbar, baseball bat, rake

wedge two inclined planes together used to raise an object or split an object

Wedge – two inclined planes together used to raise an object or split an object.

Example: knife, door wedge, ax

slide11

Screw – an inclined plane wrapped around a pole or shaft that is used to hold materials together or drill holes.

Example: drill bit, screws

wheel and axel a wheel that turns on a post to help move things quickly and easily

Wheel and Axel – a wheel that turns on a post to help move things quickly and easily

Example: steering wheel, doorknob, screwdriver

pulley made of rope and string wound around a reel to change the direction of a force

Pulley – made of rope and string wound around a reel to change the direction of a force.

Example : flagpole, clothesline, cranes, fishing reel

how work is done
How Work is Done

Energy Force Function

Work is done!